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62
Appendix D -
COSMAC Timing Summary
GENERAL TIMING:
--r
f4-
T(NOTE Il
CLOCK
INTERNAL
TIMING INTERVALS
15161710 II 12131415161710 II 12131415161710 II 12131415161710 II 121314
MACH INE CYCLE _ _ ---' _ _ C-' - ' Y -"C.;;;;.L E",--n _--''-------'C..;..YC''-'L''''E...;;.n....;.+..;..1 _-,--_..;;,.CY.c..;C""L;::..E _n ..;..+.;;;;.2 _ - " -_ _ _ _
INSTRUCTION -----.,.-----=---:--.,-y--EX-,.,E,.,..C.-I-NS-T-:c R --:. l----.---:cF=ET=C.,..,H""'"'1 NC":S=T-=-R.-l +-'-I:--rl E-X-E-C.""""IN-S=TR"""".l + i
EXECUTION
.
TIMING PULSES:
TPA
TPB
MEMORY TIMING:
ADDRESS (MAO TO MA7)
M READ
MWR (NOTE 2)
MEMORY OUTPUT
mwffi"
vz;r~5>FF-=+V///Z?//1..
fZ/Z/
j
l
VALID BYTE
-------NOTE 3
""VALID BYTE
ALLOWABLE MEMORY ACCESS TIME:s 3.5T-l s
(15
= SETTLING TIME)
TII~TNEGR~~LERVALS
15161710 II 121 31415161710 II 12131415161710 II 121 31415161710 II 121 3 1
INPUT
INSTRUCTION TIMING:
OUTPUT
TPA
TPB
STATE/N
BUS*
MWR
INSTRUCTION TIMING:
STATE/N
NO-N3
BUS
[SI'(I=6)'TPB]*
I I I
I I
I
SO
SI-
I=6/IXXX
OFF
INPUT BYTE
r-h
I
I
so---l
SI-I=6/0XXX
/////////////1
N VALID
I
-'lL//////////////////l
.A
/
BYTE OUT
I I
~
r--
I
SO OR S2 OR S3
OFF
I
I
I
SOORS20RS3
I
V/////////////~
v///////////////,
92CL-26421
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